ABAP Overview
The Advanced Business Application Programming / 4GL (ABAP/4, commonly referred to as ABAP) is SAP’s proprietary language. More than 80% of SAP R/3 is developed using ABAP. The ABAP Program code is “generated” into Byte-code at the time of Activation of the program and is processed by the ABAP Processor which is part of the Kernel and Basis Services (a set of core programs developed in C) at the time of execution. Any ABAP Program, because it requires the BASIS modules, can run only within an SAP environment.
Many features of the programming language and ABAP editor environment resemble the COBOL / IBM Mainframe environment although much of it has been scaled down somewhat to give the language a modern look. The language is case-insensitive and each statement terminates with a period.
ABAP programs are event-driven to an extent though the event handling capabilities are not similar to full-fledged object-oriented languages such as Java or even Visual Basic. ABAP objects or classes can be defined and implemented using the “Class Builder” for use in report and dialog programs.
Reporting
Report programs produce lists and can be classified as conventional reports and interactive reports.
Conventional reports do not allow interaction by the user; therefore; the basic list contains extensive information that the user must often sort through to find the relevant data.
Interactive reports allows for interaction (and drilldown) with the user;therefore the user can produce secondary, detailed lists off of the basic list by choosing the relevant data and requesting more information.
ALV Reports also allows interaction by the user, it can display large amount of data at one short in the form of excel sheet.
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